The Postal Administration of Azerbaijan has issued the stamp set of WWF series which consist of four single stamps feature the Ferruginous Duck or Aythya nyroca on May 05, 2000.
Along with this issuance the local WWF cover as the First Day Cover also issued. The cover has image of this species on the left-side and special post mark depicted Aythya nyroca.
The Ferruginous Duck , also Ferruginous Pochard (Aythya nyroca) is a medium-sized diving duck from Eurasia. The species is known colloquially by birders as "Fudge Duck". It is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.
Their breeding habitat is marshes and lakes with a meter or more water depth. These ducks breed in southern and eastern Europe and southern and western Asia. They are somewhat migratory, and winter farther south and into north Africa.
The adult male is a rich chestnut color with a darker back and a yellow eye. The pure white under-tail helps to distinguish this species from the somewhat similar Tufted Duck. The female is similar but duller, and with a dark eye.
Aythya nyroca are gregarious birds, forming large flocks in winter, often mixed with other diving ducks, such as Tufted Ducks and Pochards.
These birds feed mainly by diving or dabbling. They eat aquatic plants with some mollusks, aquatic insects and small fish. They often feed at night, and will upend (dabble) for food as well as the more characteristic diving.
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